diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d2129dd
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib/message"]
+	path = lib/message
+	url = https://git.epha.se/ephase/bash_message
diff --git a/README.md b/README.md
index 77c5f96..57c6515 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Android Oandbackup restore script
 A simple bash script to restore application backuped with OandBackup on a rooted
 Android Phone. This script can restore GPG encrypted backup.
 
+## Installation
+
 to use this script, clone the repo :
 
 ```shell
@@ -12,7 +14,29 @@ cd oandbackup_restore
 git submodule init && git submodule update
 ```
 
-This script is in devellopment, this is not a working version
+## Usage
+
+```
+$ ./restore.sh [-d] [--dry-run] <folder>
+```
+
+ - `-d` : display debug messges
+ - `--dry-run`: do nothing, just display actions.
+
+To use this script, you must have a rooted phone with a custom recovery (Tested
+with TWRP).
+
+ 1. Activate develloper mode on your phone
+ 2. Authorize your PC for debug by running adb and accept the PC on your phone.
+ 3. launch the script with the folder containing backup as argument
+ 4. When the script finished to install applications, he will reboot the phone
+    into recovery. When it's done press space.
+ 5. When it's done, reboot your phone.
+
+## Warning
+
+This script is a first working version, tested with my own phone. Use it at 
+your own risk.
 
 ## Licence